package com.heima.app.gateway.filter;
import com.heima.app.gateway.utils.common.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
@Slf4j
public class AuthorizeFilter implements Ordered,GlobalFilter{
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //获取request,response
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        //获取uri
        String path = request.getURI().getPath();
        //判断请求是否属于白名单,属于放行
        if (path.contains("/login")) {
            return chain.filter(exchange);
        }
        //检验请求头中是否有Token
        String token = request.getHeaders().getFirst("token");
        if (StringUtils.isBlank(token)) {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //检验Token是否有效
        try {
            Claims claimsBody = AppJwtUtil.getClaimsBody(token);
            //token是否过期
            int result = AppJwtUtil.verifyToken(claimsBody);
            if (result == 1 || result == 2) {
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }
        } catch (Exception e) {
            e.printStackTrace();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        return chain.filter(exchange);
    }

    /**
     * 设置全局过滤器优先级
     * @return
     */
    @Override
    public int getOrder() {
        return 0;
    }
}
